Washtenaw County, Michigan

Founding: 1826 (declared in 1822)
Parent county: Wayne

Namesake: An Ojibwe word referencing the Grand River
Seat: Ann Arbor (1827–)

Land area: 706 square miles

Population (2020): 372,258

Population (historic): 4,042 (1830); 28,567 (1850); 41,434 (1870); 47,761 (1900); 65,530 (1930)

Periods of population growth: pre-1830–1900; 1910–2020

Subdivisions: Six cities; two villages; one CDP; 20 townships

Pre-1940 residences (estimated): 17,804 (11.9%)
Pre-1940 housing survival rate: 74%
Pre-1860 housing survival rate (1940): 22.7%

Farm housing in disrepair (1950): 4.1%

Nonfarm housing in disrepair (1950): 5.5%
Average farmhouse value (1930): $2,928
Average outbuilding value (1930): $2,718

Average farmhouse size (1940): 7.3 rooms
Number of farms (1920): 3,550
Average farm size (1920): 89.8 acres
Sources of settlement: New York, Germany, Ireland, Canada, and England

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Ann Arbor

Namesake: Unclear—perhaps a poetic allusion to the area's forests

Founding: 1824 (platting); 1824 (post office); 1833 (incorporation)

Population (2020): 123,851

Population (historic): 5,097 (1860); 8,061 (1880); 14,509 (1900); 26,944 (1930)

Periods of population growth: pre-1860–2000; 2010s
Pre-1940 residences (estimated): 8,080 (16%)

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